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    1 Version 2.0.0 - February 25, 2010
    2 
    3   FlightGear 2.0.0. reflects the maturation of the OpenSceneGraph port
    4   that started with the previous 1.9.0 release. In addition to many
    5   internal code improvements, FlightGear 2.0.0. marks the introduction
    6   of many new exciting improvements in the graphics and sound system,
    7   as well as improved usability of key features, and improved behavior
    8   of exsisting features. Highlights of this new version include:
    9   Dramatic new 3D clouds, dramatic lighting conditions, improved
   10   support for custom scenery, and many many new and detailed aircraft
   11   models.
   12 
   13   Sound 
   14   * Complete overhaul of the sound code
   15   * doppler effects
   16   * distance attenuation
   17   * 3D positional sound sources
   18   * assignment of sound sources to external objects (i.e. AI controlled
   19     aircraft)
   20   * User selection of the sound device
   21 
   22   Visual Effects
   23   * Use of Shaders for dynamic textures
   24   * Use of Effects files
   25   * Improved 3D clouds
   26   * Color changes based on humidity and other weather effects allow for very
   27     dramatic lighting conditions
   28   * Dynamic water textures
   29   * Text animation based on OSGText
   30 
   31   Usability
   32   * Allow screenshots in more common file formats
   33   * User selectable sound device
   34   * More intuitive selection of the weather settings through the GUI and/or
   35     commandline
   36 
   37   Infrastructure
   38   * Airport geometry data can be read from the scenery, allowing for more
   39     flexible regeneration of terrain tiles
   40 
   41   Internals
   42   * Improved efficiency of the property tree
   43   * A more efficient ground cache
   44   * Many improvements to the route management code
   45   * Removed many compiler warnings
   46   * More realistic atmosphere model
   47 
   48   Behavior
   49   * More realistic ILS behavior
   50   * Autopilot improvements
   51   * A generic autobrake function
   52   * Winds over mountainous areas cause up- and downdrafts that can be used
   53     for gliding
   54   * More realistic behavior of the route manager
   55   * Wild fires, which can be extinguished by firefighter aircraft operating
   56     across the multplayer server
   57   * Navaid frequencies and radials can be transmitted to Atlas
   58 
   59   Utilities
   60   * A python script to visualize Yasim configuration files in Blender
   61 
   62   AI
   63   * Allow traffic departing and arriving at the same airport
   64   * Add Ground Vehicles - including automobiles, trucks, articulated trucks,
   65     trains (including high speed trains)
   66   * ATC interactions between AI aircraft and ground controllers
   67   * Performance characteristics of AI aircraft can be specified in a
   68     performance database
   69   * Push-back vehicles are available for a selected number of aircraft
   70   * Add escorts for AI carrier - frigates, guided missile cruiser, amphibious
   71     warfare ships now make up the Vinson Battle Group
   72   * Improved radar functionality - now detects AI escorts etc.
   73   * AI objects are now solid (i.e. users can collide with them)
   74   * Some preliminary support for SID/STAR procedures for AI aircraft
   75 
   76 Version 1.9.0
   77 * December 20, 2008 (source code snapshot release)
   78 
   79 
   80 New in 0.9.10
   81 * April 5, 2006
   82 
   83 * Many improvements to the multi-player mode.  Other airplanes are now
   84   updated smoothly.  There is a really nifty google maps based moving
   85   map that anyone can use to track all online activity.
   86 * AI planes have improved ground following and are smarter about
   87   selecting the active runway.
   88 * Include the ability to send ATC and AI aircraft communication to a
   89   local festival server to be converted to spoken speech output.
   90 * Added a detailed model of the Honeywell MK VIII EGPWS ground
   91   proximity warning system.
   92 * Complete overhaul/redo of terrain textures based on USGS satellite imagery.
   93 * Added background ATC chatter.
   94 * Updated/improved rain cone rendering.
   95 * Updated manual.
   96 
   97 * Upgraded to JSBSim v2.0
   98 * Fix a discrepancy in sign of twist and incidence values in YASim
   99   between code and documentation.
  100 * Updates to YASim for more fine grained propeller modeling.
  101 * UFO will now honor elevator trim value so that it will respond to
  102   the autopilot altitude hold module.
  103 * UFO can adjust it's speed range so you can use it for super high
  104   speed world exploration, or extremly fine grained precise positioning.
  105 * Much work and progress with carrier interaction and launch/recovery
  106   modeling.
  107 
  108 * Add a feature that allows the end user to click any where on the
  109   terrain.  The system will compute a ground intersection and report
  110   back the lon, lat, and elevation of the click point.  The click
  111   point is reported in the property system so it can be read by just
  112   about anything including external programs.  Later we added the
  113   ability to place an object at the click point as well.
  114 * Add a feature to play one-off wav files.  These are qeued and played
  115   sequentially.  This was then leveraged to build an ATC background
  116   chatter module in nasal that can be turned on/off at run time.  This
  117   could also be leveraged for tutorials or other interactive type
  118   scripts to play prerecorded messages at specific times or under
  119   specific conditions..
  120 * Allow clock to report local time as well as universal.
  121 * Add a model of a KLN89 GPS.
  122 * Allow nav radios to be slaved to the gps.
  123 * Allow enabling/disabling of menu entries.
  124 * Replace old hardcoded frame rate display with a much more flexible
  125   nasal/gui version.
  126 * Add a listener function to properties so that nasal code can be
  127   triggered whenever a property changes.  This is more efficient than
  128   polling.
  129 * Add a save-on-exit option to save user preferences.
  130 * Add support for point sprites.
  131 * Add support for emissive layers (such as lights) on 2d panels.
  132 * Updated gui styles.
  133 * Updated airport and navaid data.
  134 * Added a new Nasal/XML based tutorial system.
  135 
  136 * Fix a bug in the metar (real weather) threading that could lead to
  137   long pauses and even crashes.
  138 * Various compiler/platform fixes.
  139 * Fix various valgrind complaints.
  140 * Better use of exceptions in places.
  141 * Fix the 2d compass texture handling.
  142 * Many tweaks and improvements to our keyboard input handling system.
  143 * Added a first attempt at MS-VC8 project files.
  144 
  145 * Updated aircraft:
  146   - A4/A3F (cleanups and updates, functional drag chute)
  147   - A-10 (3d cockpit, fdm tuning, munitions, drop tanks)
  148   - AN-225 (fdm tuning)
  149   - B1900D
  150   - BO105 Eurocopter (new livry/logo options.)
  151   - B-29
  152   - B-52F (major overhaul)
  153   - Boeing 314 (3d cockpit, fdm updates)
  154   - 747 (modeling fixes)
  155   - Cirrus SR20 (improve interior a bit)
  156   - C172 (added KLN89 gps)
  157   - C310 (many modeling updates)
  158   - Citation Bravo (many modeling updates, Primus 1000 PFD)
  159   - Concorde (updated to v2.1, new views, sounds autopilot, fdm
  160     updates, new systems)
  161   - DHC2 Beaver
  162   - F-16 (modeling and munitions updates)
  163   - Hurricane
  164   - Hunter
  165   - MiG-15bis (adds some 3d cockpit instruments)
  166   - PC7 (various cleanups)
  167   - Seafire/Spitfire
  168   - Seahawk (general tidy up, cannon, heat haze, catapault launch strop)
  169   - T37 (geometry, sound, fdm updates)
  170   - YF-23 (misc model updates)
  171 
  172 * New aircraft available:
  173   - Boeing 707
  174   - 737-300 (Brand new version)
  175   - Canberra BI8
  176   - English Electric Lightning (F.1A)
  177   - Lockheed 1049 Constellation
  178   - Lockheed F-80C Shooting Star
  179   - Messerschmitt Bf 109
  180   - Ogel (a for-fun fantasy airplane.)
  181   - New OV-10 with Clickable 3D cockpit
  182   - Piper PA24-250 Comanche 250 (N7764P)
  183   - Piper Aerostar 700
  184 
  185 
  186 New in 0.9.9
  187 * November 17, 2005
  188 
  189 * New well integrated volumetric clouds by Harald Johnsen
  190 * Removed 'old' 3D clouds code.
  191 * Fixed the jitter problem with 3d cockpits.
  192 * Volumetric shadows are now supported so that aircraft can cast
  193   shadows upon themselves as well as the ground.
  194 * Better support for redoing livery textures on an individual aircraft.
  195 * Support for seasonal terrain textures.  (Updates to summer textures
  196   plus new winter textures added.)
  197 * Carrier - added working arrester wires and catapults. The carrier is
  198   selectable as a starting position. AI has been added to the 
  199   carrier in the form of an operating box and an automated turn
  200   into/out of wind. TACAN beacon added.
  201 * Extensive revisions to the Multiplayer code. Multiplayer servers are
  202   now available.  A Google-based map server is also available
  203 * Enhanced weather modeling (lightning and rain.)
  204 * Support for high G redout/blackout effects.
  205 * Add status updates to the initial splash/startup screen.
  206 * Allow switching the tower view location at any time.
  207 * Add support for configuring views with asymmetric view frustums.
  208 * Many updates to gui/dialog box infrastructure.  Ability to alter
  209   border thickness, change fonts, dialog boxes are draggable across
  210   the screen, you can enable automatic line wrapping, select
  211   colors, and allow key presses to be bound to widgets.
  212 * Replaced many hardcoded dialog boxes with xml configurable dialog boxes.
  213 * Support for xml configurable gui themes.
  214 * Help dialog boxes supported for each aircraft listing special keys,
  215   global keys, procedures and performance data.
  216 * Updates and enhancements to many of the dialog boxes to fix problems,
  217   expose new features, enhance usability, etc.
  218 * Added a generic, XML configurable, autopilot framework, and several
  219   high level, configurable filter implementations for use by autopilot
  220   designers.
  221 * Added a transponder and Altitude encoder.
  222 * Made the instruments code much more configurable, it is now possible to
  223   only include instruments that are actually present.
  224 * Implemented the groundcache code which made it possible for aircraft
  225   to follow the ground precisely and, as a result, made it possible to
  226   land on aircraft carriers. 
  227 
  228 * Updated JSBSim version since the last release.  (More updates
  229   pending after this release.)
  230 * YASim: expose "spool-time" of a jet engine as a config parameter,
  231   add an oil temp model, support gear compression along any arbitrary axis,
  232   reworked MP calculations for super/turbochargers.
  233 * Allow setting individual sample/update rates for any of the PID
  234   autopilot stages.
  235 
  236 * Support TACAN instruments.  And an IVSI instrument.
  237 * Support for new animations and effects such as heat-haze and chrome.
  238 * Dynamic taxiway following at airports equipped with a logical ground
  239   network.
  240 * Ability to define "AI" scenarios with scripted moving objects that
  241   interact intelligently with the environment and the simulator state.
  242 * Depricated old (somewhat less the spectacularly conceived)
  243   electrical system model in favor of a much more flexible script based
  244   system that can be tailored to any individual aircraft.
  245 * Include an external utility that can feed saved nmea tracks back
  246   into FlightGear.  If you take a gps on a real flight with you and
  247   capture the output, you can replay your flight in FlightGear.
  248 * Added a function that can intersect any arbitrary vector with the
  249   loaded scenery and return the hit point.
  250 * Many updates and fixes to the joystick configuration files, many new
  251   joysticks directly supported.
  252 
  253 * Removed all lingering dependencies on plib's SL sound library.
  254 * Add support for OpenAL 1.1 and alut.  OpenAL is a 3d sound system supporting
  255   directional sound and doppler effects.
  256   
  257   
  258 * Better cross platform compatibility with our standard network structures.
  259 * More cpu friendly frame rate throttling code that can leave more cpu
  260   available for other apps.
  261 * Various Nasal (scripting) bug fixes and language improvements.
  262 * Various bug fixes, various platform/compiler compatibility fixes,
  263   several memory leaks fixed.
  264 
  265 * New aircraft available (in various stages of developement): A380,
  266   Boeing 314 (seaplane), Citation Bravo (glass cockpit), Hurricane IIb,
  267   MiG-15bis, TU-114, B29, C150, and SR20.
  268 
  269 * Aircraft that have had updates since the last release: 737, A-10,
  270   AN-225, B-52F, BAC-TSR2, Citation-II (550), Comper Swift, Concorde,
  271   Hunter, OV10, Spitfire, T37, B1900d, bo105, C172 et. al., C182, DHC2F
  272   (Beaver), F16, Fokker DR1 Triplane, Fokker 50 (turboprop), Fokker
  273   100 (jet), J3 Cub, P51, Santa, Seahawk, and 1903 Wright Flyer.
  274   
  275 
  276 New in 0.9.8
  277 * January 18, 2005
  278 
  279 * Added an encoder and transponder to the available avionics modules.
  280 
  281 * Updates to the AI traffic manager.
  282 * Updates to the submodel system.  This allows things like contrails,
  283   payload dropping, projectile firing, and aircraft carrier landings.
  284 * Added some controls for aircraft carrier operations.
  285 * Updated to sync with latest JSBSim developments.
  286 * YAsim adds support for contra-rotating propeller pairs as well as
  287   crude models for ITT, Oil Temp and Oil Pressure in the jet turbine
  288   engine model.
  289 * Instruments, avionics, and subsystems are now configurable per
  290   aircraft.  You can assemble the correct componets available for each
  291   particular aircraft.
  292 * Updates to the wet compass to make it behave much more like a real
  293   wet compass including various errors and motion effects.
  294 * Make display list usage optional since these can be a net
  295   performance loss on some older or low memory platforms.
  296 * Make sound inaudible until after the scenery is loaded.
  297 * Make sure the ATIS reports surface winds at airports above sea-level
  298 * Default C172 3d model has been completely reworked and many things
  299   have been fixed or sized or placed more accurately.
  300 
  301 * Move radio stack and avionics code from cockpit library to
  302   instrumentation library.
  303 * Added several digital filters to the autopilot: exponential, dobule
  304   exponential, moving average, and noise spike.  These are available
  305   to aircraft designers via the autopilot config file.
  306 * Replace old basic.dat.gz and runways.dat.gz with apt.dat.gz (x-plane format)
  307 
  308 * Fix a crash that could occur when the joystick config specified more
  309   buttons or axes than the physical hardware provided.
  310 * Fixes to make FlightGear work with 16bpp visual depth.
  311 
  312 * Various FreeBSD fixes.
  313 * Various MSVC fixes.
  314 * Various Mac OS X fixes.
  315 * gcc 2.95 and 4.0 fixes.
  316 
  317 * Updated aircraft: 737, A-10, AN-225, B-52, BAC-TSR2, Concorde,
  318   Spitfire, BO-105 Eurocopter, DHC2, F-15 (updated flight control system),
  319   Fokker DR1, Fokker 50, Fokker 100, OV10, Seahawk made carrier
  320   capable (working arresting hook), 
  321 
  322 * New aircraft: Cessna Citation-II (wip), Beech 1900D, DHC-2 Beaver
  323   (on floats)
  324 
  325 * Updated KAP140 autopilot instrument (used in default C172.)
  326 
  327 * Updated Nimitz model (aircraft carrier), updated radio tower models,
  328   added Oracle head quarters to bay area scenery, added Dumbarton
  329   bridge at the south end of the SFO bay, added a model of Alcatraz, 
  330 
  331 
  332 New in 0.9.6
  333 * October 12, 2004
  334 
  335 * Added some initial support for "submodels" which can be used to
  336   impliment things like contrails, flares, tracers, etc.
  337 * Make real world weather fetching a bit more robust and network friendly.
  338 * Ensure the entire world is initially loaded before initializing the
  339   flight dynamics (avoids wildly varying frame rates at a time when
  340   the FDM might be trying to do various initialization steps that
  341   might benefit from consistent and fast frame rates.)
  342 * Other various (and minor) code cleanups, tweaks, and fixes.
  343 * Fixed ATIS voice file.
  344 * Updated aircraft: A320, Bo-105, Comper Swift, Concorde, F16,
  345   Fokker-50, Fokker-100, Hunter, MD11, PC7, Spitfire, adjust
  346   C172 cockpit sound levels, and Sgs-233.
  347 * Updated joystick configs: CH pro yoke usb, Cyborg Evo, Thrustmaster FCS.
  348 * Fix a bug in the nasal fuel tank management code.
  349 * Return Canadian ILS's to nav data.
  350 * Cleaned up some of the 3d models around the bay area.
  351 * Add support for display list based rendering which yields
  352   substantial performance gains for many systems.
  353 * Synced with latest JSBSim code.
  354 * Fixed a reference point bug in YASim.
  355 * Revived the hi-res (tiled) screen shot code so you can again produce
  356   insanely and arbitrarily large resolution screen shots.
  357 * Beefed up the tile pager so it can more sensibly handle insanely
  358   rapid motion.
  359 
  360 
  361 New in 0.9.5
  362 * July 29, 2004
  363 
  364 * New AIModel based air traffic subsystem (Durk Talsma)
  365 * Updates to the AIModel subsystem.
  366 * Switched audio subsystem from plib's "sl" to OpenAL.
  367 * Added support for SDL (pre-compile time configuration option.)
  368 * Threaded tile loader now enabled by default.
  369 * Overhauled Nav database code to directly support Robin Peel's default format.
  370 * Synced with latest JSBSim developments.
  371 * YASim now supports a nasal (script) based fuel management system.
  372 * YASim adds a simple turbo prop engine model.
  373 * Added an xml based gui/widget layout system for building dialog boxes.
  374 * Make gui windows dragable/repositionable.
  375 * Hide the mouse pointer when it sits idle.  Mouse pointer reappears
  376   on any mouse motion.
  377 * The GPS module has been overhauled.
  378 * New joystick configurations added: Cyborg Evo, Top Gun Fox2 Pro USB,
  379   MacAlly iStick USB, SideWinder Precision Pro (on Windows.)
  380 * Updated aircraft: 747 flight dynamics model, A-10, AN-225, B-52F, BAC-TSR2,
  381   T-37, T-38, YF-23, Beech-99, BO-105 (helicopter), DC-3, F-104, F-16,
  382   Fokker 50, Fokker 100, Pilatus PC-7.
  383 * New aircraft: Concorde, MD-11, Spitfire IIA, TU-154.
  384 * Updated airport, runway, taxiway, windsock, beacon, and tower data.
  385 * Updated world scenery based on SRTM terrain data.  New scenery includes
  386   accurate radio towers for the USA.
  387 * Fix a small bug in the "generic" export protocol.
  388 * Fix (workaround) the shrinking dialogs bug.
  389 * Delay FDM initialization until initial scenery is fully loaded.
  390 
  391 New in 0.9.4
  392 * March 26, 2004
  393 
  394 * Impliment SimGear's (aka Andy's) Nasal scripting language in
  395   FlightGear and integrate with the FG property system.
  396 * Many updates from David Culp and David Luff to the AI aircraft and
  397   ATC modules.
  398 * Complete overhaul of the autopilot system.  The new system uses a
  399   much more advanced PID algorithm, is much more flexible, and is
  400   completely reconfigurable for each aircraft.
  401 * Added the ability to fetch current weather in real time during a
  402   flight (via a thread) from the weather.noaa.gov web site and update
  403   the current weather conditions in the sim.
  404 * Added properly working VASI/PAPI lights.
  405 * Make the ground intersection code smart so allow flying under
  406   bridges, taxiing on the lower level of the bay bridge, taxiing into
  407   hangers, etc.
  408 * Added a utility to automatically manage scenery installation and
  409   removal.
  410 * Several updated ground textures, plus a variety of new random
  411   scenery objects.
  412 
  413 * Much additional work on the San Francisco area buildings and bridges.
  414 
  415 * Added a Comper Swift (nice), a Hawker Hunter (nice), added a T37 Tweet, 
  416 
  417 * Updates to the 737 (nice panel, 3d model, and flight model), updates
  418   to the 747 flight dynamics, updates to the OV10, T38, AN-225, bo105
  419   (helicopter), better sounds for the DC-3, updates to f104 model,
  420   many updates to the F16, updates to the J3 Cub, 3D cockpit added to
  421   the pa28-161, updates to the sgs233, overhaul of the tsr2 and yf23
  422   models.
  423 
  424 * The UFO became Santa Claus over the holidays, but it is back to
  425   being extra terrestial.
  426 
  427 
  428 * First stab at a weather radar instrument.
  429 
  430 * Added a number of basic 3d instruments to the instrument library
  431   that could be reused used for any general aviation cockpit.
  432 
  433 * Clean up much of the extraneous alias system entries for aircraft.
  434   Generally this means that if there is only one version of an
  435   aircraft, there is only one entry and no aliases.  If there are
  436   multiple versions of an aircraft, we may still have an alias to
  437   point to the prefered or default version.
  438 
  439 * Added RedHat packaging files.
  440 * Added some perl script utility functions which are useful when
  441   writing remote perl scripts that interact with a running copy of
  442   FlightGear.  Includes routines to facility remote control of data
  443   logging and even some simple graph plotting.
  444 * Updates to OpenGC interface.
  445 * Various JSBSim updates.
  446 * Various YASim updates.
  447 * Various UIUCsim updates.
  448 * More work on the native multiplayer system.
  449 
  450 * Sorted out the confusion between left, right, and parking brakes
  451   vs. the cockpit controls vs. the wheels they apply to.
  452 * Much infrastructure added to support future GPS instruments.
  453 * Fixed a meter/feet conversion problem in DME distance calculations
  454   which would cause it to often read quite high.
  455 * Fixes to nmea output so it can better trick a moving map software
  456   application into thinking it is talking to a real gps.
  457 
  458 * Fixed a subtle problem with our star database that has been lurking
  459   for many years, but it took an astronomy expert to spot the subtle
  460   misalignments.
  461 
  462 * Add support for Logitech Extreme 3D Pro, thrustmaster top gun
  463   afterburner USB, Logitech WingMan Force 3D, Logitech Extreme 3D Pro
  464   USB, and Microsoft SideWinder 3D Pro joysticks.
  465 
  466 * Removed the old WeatherCM module (it can be resurrected from CVS if
  467   any one ever wants to do that.)
  468 * Removed the NetworkOLK module (it can be resurrected from CVS if
  469   any one ever wants to do that.)
  470 * Removed support for the PSL scripting language.
  471 
  472 
  473 New in 0.9.3
  474 * October 24, 2003
  475 
  476 * Added a flight "replay" system.
  477 * Many updates to the ATC and AI aircraft subsystem. (David Luff)
  478 * Add support for moving cloud layers.
  479 * New "symbolic" time of day dialog box for easily setting dawn, dusk,
  480   noon, etc.
  481 * Aircraft are now each self contained in their own individual
  482   subdirectories for easier end user addition and removal.
  483 * Many improvements to scene lighting throughout the day->night range
  484   including more realistic sky and fog colors, more realistic scene
  485   illumination, better dusk/dawn sky coloring, better specular
  486   lighting support.
  487 * A nice new chase view has been added.
  488 * Added displaced thresholds on all runways that have them.
  489 * Updated default scenery for the KSFO area.
  490 * Many buildings and bridges added in the San Francisco area.
  491 * Updated airport and navaid database, many new taxiways, many
  492   corrected runways, many new airports (especially outside the USA.)
  493 * Updates to the man page.
  494 * Better Win32 packaging (more standardized installer, plus a launcher
  495   which allows selection of starting location and starting aircraft.)
  496 * Added an initial cut at modeling helicopters.
  497 * Support multiple inside the cockpit views.
  498 * Updated FlightGear Flight School tutorial.
  499 
  500 * Use the field elevation for GS when no specific altitude listed in
  501   FAA/DAFIF data
  502 * Fix to translate DME and TACAN X/Y channels to paired VHF frequencies
  503   correctly.  Thanks to Jorge Van Hemelryck <ml@jvh.net> for the fix.
  504 * Fixes to runway search routines (didn't always work correctly under
  505   some circumstances.)
  506 * Many fixes and updates to the autopilot.  Autothrottle tracks speed
  507   much better with much less jumping around.  
  508 * Expose the tuned navaid via the property system to support building
  509   more advanced avionics.
  510 * Improvements to the environment manager and gui's, more control over
  511   turbulence, ability to specify boundary condition layers as well as
  512   aloft condition layers.
  513 * JSBSim updates including a new turbine engine model that supports
  514   things like starting and stopping procedures and thrust reversing.
  515 * UIUCsim updates (compiler warning and namespace conflict fixes.)
  516 * YASim updates (fix drag from shutdown engine, helicopter support,
  517   better in air startup support.)
  518 * Support for "clock" instruments that operate independently of
  519   computer system time.
  520 * Annunciators shouldn't work if electrical system not serviceable.
  521 * A few updated splash screens.
  522 * Added various fields to net_ctrls and net_fdm to include various
  523   failures, faults, control surface positions, and other interesting
  524   things.
  525 * A few updated joystick definition files.
  526 * Various keyboard mapping tweaks and changes.
  527 * Many updates and tweaks to default material properties and random
  528   land cover objects.
  529 * Updated aircraft: 747, A320, T-38, A-10, B-52, F-104, Fokker 50,
  530   Fokker 100, Piper Cub, P-51, UFO, YF-23, Ornithopter, A-4, C172,
  531   and F-16
  532 * New Aircraft: J-22, Paraglider, SGS-126 Sailplane, ASW 20, and
  533   AN-225 aircraft; Bell 206 JetRanger, CH-47 Chinook, and Ecureuil
  534   AS-350 helicoptors.
  535 * Updated cloud textures.
  536 
  537 * Removed dependency on Metakit.  The airport and runway databases are now
  538   stored in a simple flat file ascii database.
  539 
  540 * FreeBSD, Solaris, MSVC, Irix, Mac OSX, cygwin, and mingwin fixes.
  541 
  542 
  543 New in 0.9.2
  544 * June 4, 2003
  545 
  546 * New aircraft available: P51-D (w/ full 3d cockpit), Sea Hawk
  547   (WV908), a research ornithopter (propelled by actual flapping
  548   wings), A10, B-52, F-104, F-15, F-16, OV10, PA28-161, T-6A Texan II,
  549   T-38, British TSR2, YF-23, 737,
  550 
  551 * Updated aircraft: airwave extreme hang glider, asw20 glider, A-4
  552   Skyhawk, Beech-99, Cessna 172 w/ 3d cockpit, Cessna 310 w/ 3d
  553   cockpit, DC3, Piper J3 Cub, 1903 Wright Flyer, Sopwith Camel, Space
  554   Shuttle, Boeing 747-400
  555 
  556 * Overhauled menu/gui system and made it xml configurable rather than
  557   hardwired.  Include support for things like checkboxes, sliders, and
  558   dials.
  559 
  560 * Added some early multiplayer features.
  561 
  562 * Added support for in-air presets relative to a VOR, NDB, or fix.
  563 
  564 * Support for Futaba, Airtronics, Hitec, JR, Multiplex and Tower R/C
  565   transmitters using the RCJoy USB interface box (see
  566   http://www.rcjoy.com).
  567 
  568 * Much improved sky and coloring as well as more realistic coloring of
  569   the sunset and sunrise.
  570 
  571 * Clouds are drawn on a surface that better matches the underlying
  572   curve of the earth.
  573 
  574 * A few updated terrain textures, better variety of random ground
  575   cover objects.
  576 
  577 * Most weather options can now be set via the GUI.  Added an option to
  578   randomize the weather.
  579 
  580 * Various instruments and systems can now be failed/unfailed via the
  581   GUI.
  582 
  583 * Developed scripts to build Navaid and ILS databases from DAFIFT,
  584   FAA, and other data sources.
  585 * Update Navaid and ILS databases based on DAFIFT, FAA, and other data
  586   sources.
  587 
  588 * Continued development of voice ATC, robot aircraft AI, logical
  589   taxiway networks (continues to be a work in progess, but much
  590   progress has been made.)
  591 * Separated out much of the low level model/material management code
  592   and moved it over to SimGear where it can be potentially used by
  593   other projects.
  594 * Separated out the low level sound effect playing/management code and
  595   moved it over to SimGear.
  596 * Added functions to the "telnet" interface to allow remote management
  597   of autopilot waypoints.
  598 * Support the parking brake in the "external" flight dynamics interface.
  599 * Added support for an audio panel (set of switches to set various
  600   avionics audio sources on/off in the aircraft.)
  601 * Add support for speed brake and spoiler controls.
  602 * Many code updates to UIUCmodel including support for ornithopters
  603   (flapping wing vehicles.)
  604 * Many JSBsim code updates include a new turbine engine model.
  605 * Added a "named pipe" external flight dynamics model interface.
  606 * YASim updates including support for manual-pitch control props,
  607   support for wing washout, and adjusting aircraft masses as fuel is
  608   consumed.
  609 * The property picker interface now shows the property values changing
  610   dynamically.
  611 * Added support for a simple annunciator panel (fuel, oil, vacuum,
  612   volts dummy warning lights.)
  613 * Added a "gyro" model.  This can be driven electrically (turn
  614   coordinator) or via vacuum (attitude indicator).  If one of these
  615   systems failes, the corresponding gyro will spin down realistically
  616   an introduce realistic errors in the gauge reading.
  617 * Model attitude indicator tumbling at extreme attitudes.
  618 * Modeled the pitot system and use that drive the air speed indicator. 
  619 * Added a very simplistic volts/amps model to the electrical
  620   system...enough to make the gauges behave plausibly and drive the
  621   annunciator panel correctly.
  622 * Updated the vacuum/suction model to behave more realistically.
  623 * Added Italian and Polish translation for the GUI.
  624 
  625 * Mac OS X fixes.
  626 * Better FreeBSD support.
  627 * Mingwin fixes.
  628 * Improved native sgi compiler support.
  629 * MSVC fixes.
  630 
  631 * Fixed problems in marker beacon audio.
  632 * Fixed several subtle problems in the modeling/positioning of glide
  633   slope transmitters in FlightGear
  634 * Don't allow the dewpoint to go higher than the temperature.
  635 * Don't allow gust speed to be less than base wind speed.
  636 * Fix a couple problems in the external fdm interface that prevented
  637   FlightGear from being driven properly by an external source (i.e. to
  638   act as a image generator only.)
  639 * Fixes to camera parameters for external views (especially when rotating
  640   the view around the different axes.)
  641 * Many miscellaneous code clean ups, many bug fixes, and much code
  642   refactoring.
  643 
  644 
  645 New in 0.9.1
  646 * December 5, 2002
  647 
  648 * Fixes a problem with a missing file in the source distribution of 0.9.0
  649 * Updates to AI aircraft subsystem (this is a work in progress)
  650 * Added a canned ATC voice handling class (using prerecorded voice snippets.)
  651 * Added voice ATIS
  652 
  653 
  654 New in 0.9.0
  655 * December 3, 2002
  656 
  657 * Support for fully animated, fully clickable 3d instrument panels.
  658 * Support for runway, approach, and taxiway lighting.  Lighting is
  659   directional and intensity varies smoothly with relative view
  660   direction.
  661 * Many new and updated aircraft.
  662 * Improved runway textures.
  663 * Some improved terrain textures.
  664 * Added a util called terrasync to runtime fetch just the scenery you
  665   need from the master scenery server as you fly.  No need to
  666   pre-download large chunks of data.
  667 * Add a vacuum system and support for it's failure.
  668 * Add a pitot system and support for it's failure.
  669 * Model gyro spin for various instruments.
  670 * Added support for modeling complex aircraft electrical system.  Sample
  671   implimentation for a C172, simplistic electrical model provided for
  672   other aircraft until their specific system is modeled.
  673 * Added a "presets" section to the GUI.
  674 * Localization support for GUI and for command line option help, including
  675   the ability to specify a custom per language font.
  676 * Support for specifying an initial startup runway.
  677 * Splash screen now slowly fades out revealing the ready to run sim.
  678 * Support additional joysticks: Logitech WingMan Force,
  679    Logitech WingMan Extreme Digital 3D (USB), and Saitek Cyborg Gold 3D USB,
  680    CH Virtual Pilot USB/USB CH Pedals, 
  681 
  682 * Many updates to External/Network FDM interface.
  683 * Many updates to the JSBSim FDM model code.
  684 * Many updates from the UIUC folk to their FDM package.
  685 * Many updates to the YASim FDM model code (fuel usage, tunable
  686   induced drag parameter, better gear tuning, fix a ground effect bug,
  687   and a standalone config file compiler.
  688 * Make rotational rate FDM values available in the property tree.
  689 * Fix a subtle bug in the ssg partial tree deleter code.
  690 * Started a new XML configurable GUI subsystem.
  691 * Some preliminary support for AI driven aircraft.
  692 * Fix ILS back course needle deflection.
  693 * Fix for ATI driver "issue" causing instrument panels to be all gray.
  694 * Support for toggling 3d instrument hotspot visibility (debugging/learning
  695   tool.)
  696 * Tweaks to instrument panel night lighting.
  697 * Added a per engine fuel pump switch.
  698 
  699 * NOMINMAX fix for cygwin/gcc-3.2
  700 * Renamed External FDM to NullFDM
  701 * New module/submodule system.
  702 * IRIX build fixes
  703 * Restructured some of the initialization code to facilitate reseting the sim
  704   to alternate presets (airport, runway, offset distance, altitude, speed, etc.)
  705 * Fixed DG heading bug hold to work with new instrumentation updates.
  706 * Updates to autopilot to let it work with perfect values as a compile time
  707   option.
  708 * Split Nav/Com units, and DME out into their own source files.
  709 * Fixes to support newer versions of plib/cvs
  710 
  711 
  712 New in 0.8.0
  713 * September 7, 2002
  714 
  715 * The world is now populated with random ground objects with
  716   appropriate type and density for the local ground cover type
  717   (buildings, water towers, farm houses, silos, cows, trees, etc.)
  718 * Many (most?) ground textures updated for a much nicer, more coherent,
  719   more realistic overall look and feel.
  720 * Added a java client library for FlightGear.
  721 * Added some external scripting examples (python.)
  722 * Implemented a Bendix/King KT 70 transponder.
  723 * Implemented a Bendix/King KR 87 adf.
  724 * Added support for 3d instrument panels inside 3d cockpits.
  725 * Added support for animation of 3d models tied to internal properties.
  726 * New/updated aircraft include: Cessna 172, Piper J3 Cub, DC-3, A4
  727   Skyhawk, Cessna 310, 747, 1903 Wright Flyer (non-linear with stall
  728   modeled, based on wind tunnel data.)
  729 * Convert the magic carpet into a UFO, complete with sound effects and
  730   a 3d model (based on real world data of course.) :-)
  731 * Environment manager overhaul
  732 * Support for a base wind speed with gusts.
  733 * Support for a base wind direction with variation.
  734 * Support for more dynamically reconfigurable cloud layers.  Cloud
  735   layers are no longer hard coded.
  736 
  737 * Updates and additions to the FAQ
  738 * Improvements to the sound effects module.
  739 * Autopilot fixes to allow it to work much better on large airliners.
  740 * Added a generic interface for running the flight dynamics model as a
  741   separate process communicating via a network connection.
  742 * Synced with the latest JSBSim code.
  743 * Synced with the latest UIUCmodel code.
  744 * Many fixes and updates to the YASim FDM (fixed flap drag issue, new
  745   tail wheel lock, lots of solver fixes, and fixes to other internal
  746   stuff.)
  747 * Added support for menus defined in an xml file.
  748 * Make the help system start more robustly/quickly in Win32
  749 * Added support for detecting the name of a joystick and using the
  750   appropriate default joystick config file.
  751 * Overhauled the remote/network property interface.
  752 * Added a --show-aircraft option to dump out a list of all the
  753   available aircraft you can select with the --aircraft=NAME option.
  754 * Added a --random-wind command line option.
  755 * --wind= option can now contain ranges,
  756   i.e. --wind=min_dir:max_dir@min_speed:max_speed; the system will
  757   automatically vary the wind within these ranges.
  758 * A "physical" crash (i.e. too-hard impact with the ground) causes the
  759   sim to freeze.  You can then reset the sim to the starting state
  760   with the menu->reset option.
  761 
  762 * Support in the scenery tile cache for maintaining tiles in the cache
  763   relative to several view points that could be *very* far apart.
  764 * Brake makes the magic carpet fly backwards.
  765 * Many clean ups, fixes, and improvements with the tile pager.  Memory free
  766   is now done incrementally and spread out through multiple frames to hide it.
  767 * Modernized the autoconf/make scripts.
  768 * Cleaned up old cruft from the build system.
  769 * Default to using FGEnvironment
  770 * Removed support for efence (in favor of valgrind.)
  771 * Bumped minimum plib version required up to 1.4.2, however the latest
  772   cvs (and hopefully release) works much better.
  773 * Added valgrind debugging config files/scripts.
  774 * Weeded out many warnings/errors flagged by valgrind.
  775 * Overhauled the FGSubsystem class.
  776 * Fixed reporting of winds, cloudbase and altimeter setting.
  777 * FGSteam converted to a proper FGSubsystem.
  778 * Fix fog on 3dfx cards.
  779 * Added internal support for turning each tank on/off individually.
  780 * Added support for a fuel selector switch.
  781 * Fixes to builtin property browser.
  782 * Fixed several math overflow problems with time elapsed calculations
  783   that had crept in.  These would cause some things to stop updating
  784   (like portions of the instrument panel, and radio station frequency
  785   matching.)
  786 * Updates to the network OpenGC interface.
  787 
  788 * Irix fixes.
  789 * Mac OS X fixes.
  790 * MSVC fixes.
  791 * IA-64 w/ Intel compiler fixes.
  792 
  793 * automake/conf script enhancemnts and fixes.
  794 * Updated the UIUCModel code.
  795 * Removed some dos line endings that crept in.
  796 * Spelling fixes.
  797 * Removed some depricated code related to the old view management system.
  798 * Fix a problem with VOR station lookups where we wouldn't always find
  799   the closest station of a given frequency.
  800 * Changed the default Nav radio frequencies to be more appropriate for SFO.
  801 * Retrimmed the C172
  802 * Added seats and other interior stuff to the J3 Cub, and retrimmed.  Also
  803   fixed wing incidence in the 3d visual model.
  804 * Fixed C310u3a-3d.  3d cockpit instruments can now be seen.
  805 * Fixes to the DC-3 such as tank location; other surface and wheel position
  806   adjustments.  Increase effectiveness of rudder, vstab, and hstab.
  807 * Updated some of the preconfigured joystick files.
  808 * Updated man pages
  809 * Fixed problem with pressure/altitude getting botched up after a reset
  810 * Use a nicer helvetica font for the menus.
  811 * Various fixes to the internal pui property browser.
  812 * Fixed a typo in the scenery file loader that could cause a crash on
  813   some platforms.
  814 * More joystick configuration defaults. (Saitek Cyborg Gold 3D USB,
  815   non FF sidewinder precision 2 usb)
  816 * More texture tweaks.
  817 * Additional fixes and panel work for the J3 Cub.
  818 
  819 
  820 New in 0.7.10
  821 * April 20, 2002
  822 
  823 * Much work on drawing and animating 3d aircraft models for things like the
  824   chase and tower views.  Propellers spin, control surfaces move, gear
  825   retracts, etc.
  826 * Overhauled mouse handling code and make it user configurable.
  827 * Added a new environment (as in weather) subsystem.
  828 * Added a new logging module
  829 * Aded a new ATC subsystem.
  830 * Virtual 3d Cessna 172 cockpit (work in progress) but many things are
  831   animated and working.
  832 * Virtual 3d Cessna 310 cockpit.
  833 * Instrument panel background can now be a set of tiled textures so we can
  834   achieve *much* higher resolution.
  835 
  836 * Major property manager overhaul.
  837 * Major view code overhaul.  All views are now configurable via config files.
  838 * Major overhaul of the sound manager, it is now much more
  839   configurable with many sound effect improvements.
  840 * Seperate XML I/O opertions into a separate header.
  841 * Impliment a standard FGSubsystem interface for module consistency.
  842 * Add waypoint dialog now shows entire current waypoint list in a scroll box.
  843 * Elevator trim position now shown on the HUD.
  844 * Use an LED font for radios (and added infrastructer/support for
  845   additional fonts.)
  846 * Continued work on developing a generalized network interface to an external
  847   flight dynamics model running as a separate process on the same or different
  848   machine.
  849 * Initial glideslope and climb rate can be specified from the command line.
  850 * Fixes and improvements to make ground trimming more robust.
  851 * Many JSBSim updates and improvements, JSBSim now exports all it's 
  852   interesting internal state via the property manager.
  853 * Many updates to UIUCsim including support for non-linear models, flaps.
  854 * Move tower view location when teleporting to a new airport.
  855 * Created a new /devices subtree in the property manager to display
  856   current device status.
  857 
  858 * Many YASim updates and bug fixes, autogen contact points for
  859   collision detection, support for full engine startup procedure,
  860   minimal support for magnetos, support skid objects (non-rolling gear
  861   objects), reduce idle power a bit, export gear compression amount to
  862   the property tree, include wind when computing airspeed, 
  863 
  864 * Fixes to the property picker/browser.
  865 * Fixes and updates to the configure script.
  866 * Several potential memory abuse bugs detected (valgrind) and fixed (Melchior)
  867 * Fix an instrument panel text bug ... an integer overflow could prevent
  868   the text from displaying if the panel was turned off for more than 37.8 
  869   minutes.
  870 * Fixed a segfault when trying to audibly ident a nav station.  Changes in
  871   the sound manager code broke some assumptions.
  872 * Fixed a bug (another int overflow) which could trick the event
  873   manager into thinking the next time to run the events is *way* in
  874   the future.
  875 * Various performance optimizations.
  876 * More work on saving/restoring flights
  877 * Of all the ILS stations of the specified frequency, pick the one the most
  878   directly points at us.
  879 * Various restructures in the scenery loading code in preparation for
  880   more flexible runway lighting support.
  881 * Fixes/improvements to the scenery/line interesection code.
  882 
  883 * Various IRIX fixes.
  884 * Various MSVC fixes.
  885 * Various compiler warning messages fixed.
  886 
  887 
  888 New in 0.7.9 (final)
  889 * February 16, 2002
  890 
  891 * Fixes to the Thanks file.
  892 * Fix --time-offset in the man page and options help.
  893 * Fixed the spelling of Celsius.
  894 * Cleaned up some stray cout's
  895 * Removed some redundant FG* class qualifiers in various headers.
  896 * GUI dialog box fixes for autopilot.
  897 * Ensure that initial engine settings are copied over from FlightGear
  898   to JSBSim.
  899 * FreeBSD fix from JSBSim.
  900 
  901 
  902 New in 0.7.9pre2
  903 * February 13, 2002
  904 
  905 * JSBSim FGPiston mixture improvements
  906 * Enable Audio by default in MSVC builds
  907 * Added a clock freeze option.
  908 
  909 
  910 New in 0.7.9pre1
  911 * February 12, 2002
  912 
  913 * Switch to JSBSim (jsbsim.sf.net) as our default flight model.
  914 * Added additional aircraft: Cessna 182, Cessna 172 (ifr panel),
  915   and a Cessna 310 (twin prop).
  916 * Added an entirely new set of flight dynamics modeling code by Andy Ross.
  917   Includes several aircraft such as a 747, A4, and DC-3.
  918   This is (Y)et (A)nother Flight Dynamics (Sim)ulator.  It is a first cut
  919   of a "different take" on FDM design.  It's intended to be very simple
  920   to use, producing reasonable results for aircraft of all sorts and sizes,
  921   while maintaining simulation plausibility even in odd flight conditions
  922   like spins and aerobatics.  It's at the point now where one can
  923   actually fly the planes around.
  924 * Added an optional embedded http server that provides a property
  925   manager interface to external programs and scripts.
  926 * Added an optional embedded http server that can serve out live
  927   screen shots to anyone on the web.
  928 * Sync with the latest JSBSim code.
  929 * Added simple ATIS support.
  930 * More flexible autopilot that can be tuned per aircraft.
  931 * Many updates to the HUD to allow it to handle a much bigger set of
  932   symbology and functionality
  933 * Support for back course ILS approaches.
  934 * Implimented DME ETE and speed.
  935 * Added support for rudder and aileron trim.
  936 * Many improvents with piston engine and propeller modeling.  Engine
  937   startup procedures work, and engine guages work.
  938 * Added support for retractable gear.
  939 * Added 'master freeze' and 'fuel freeze' modes.  Would like to add
  940   other freeze modes soon.
  941 * Added a 'high' level aircraft config file that specifies things like
  942   the FDM code to use, the aircraft config file, the 3d model, the
  943   instrument panel, autopilot config, etc.
  944 * Added a neat external 'chase' view control panel.
  945 * Added a GUI interface to the property manager system.
  946 * Moved keybinding definitions to a config file.
  947 * Many additions and improvements to the sound effects including
  948   stall horn, tire squeek, ground rumble, wind noise, flaps, etc.
  949 * Enable introduction music in windows (off by default on all platforms)
  950 * Added support for the OpenGC glass cockpit project.
  951 * Added support for flying ILS approaches in both runway directions if the
  952   same frequency is used in both cases.
  953 
  954 * Added an autogen.sh script for those compiling from CVS code.
  955 * Attempt to support more incompatible varients of the
  956   automake/autoconf tools.
  957 * Added basic man pages.
  958 * Removed old remnants of plib-1.2.x support.  Plib-1.4.x is now required.
  959 * Added support for building mandrake packages (other packaging system
  960   contributions welcom.)
  961 * Various initialization and startup sequence fixes and tweaks.
  962   This helps get the flight dynamics model going reliably and robustly.
  963   It also helps get initial time of day effects correct.
  964 * Fixed a config problem that could lead to bogus builds for people with
  965   Voodoo cards.
  966 * Better support for running with an alternate time/date for when we
  967   are being slaved to an external data source.
  968 * Fixed (simplistic) terrain following autopilot mode.
  969 * Fixes to problems with window aspect ratio that could surface if the
  970   window was resized.
  971 * Fix several off by one errors in hud_card.cxx
  972 * Fix gauge spelling error.
  973 * Modified FGSubsystem::update() to take an int parameter for delta time.
  974 * Many internal fixes and enhancements to the core code that manages
  975   instrument panel modeling and rendering.
  976 * LaRCsim EGT doesn't show 'running' values while cranking.
  977 * Fixes to JSBSim so that the slip/skid ball is much more realistically modelled
  978 * Added support for an unlimited number of fuel tanks.
  979 * Multi-engine throttle fixes.
  980 * A round of updates to the UIUC flight dynamics model.
  981 * Fixed an annoying tile cache scheduling bug.  This makes tile paging
  982   much more robust even with teleporting and reseting.
  983 * Fixed a potential mouse freeze up condition on windows.
  984 * Converted the materials file to xml.
  985 * Tweaked and updated initial option and config file parsing to be
  986   more intuitive and robust.
  987 * Check for the proper version of the base file and exit gracefully
  988   if not found.
  989 * Fixed a problem with the initial view offset being lost.
  990 * Various floating point / initial value bug fixes
  991 * Added support for tracing property manager reads and writes (for
  992   debugging purposes.)
  993 * Fixed the problem where the simulator clock time would go goofy
  994   when scenery was being loaded.
  995 * Make the tile cache system more tolerant of situations where the tile
  996   cache is full, but no entry qualifies for removal.
  997 
  998 * MSVC fixes.
  999 * IRIX fixes.
 1000 * FreeBSD fixes.
 1001 * Mac OS X fixes.
 1002 * Better cygwin and mingwin support.
 1003 * Better support for gcc-3.0
 1004 
 1005 
 1006 New in 0.7.8
 1007 * July 13, 2001
 1008 * Updated to the latest JSBSim flight dynamics model (http://jsbsim.sf.net)
 1009 * First release of a bundled utility: fgjs which assists you in creating
 1010   a joystick/button configuration for your setup.
 1011 * Updated airport data file with taxiways at many major airports.
 1012 * Better support for using an external browser to view online help
 1013   components.  Windows support for this will be included in the next
 1014   revision.
 1015 * Now using plib-1.4.x which supports more than 3 concurrent sounds.
 1016 * Most of the README's and documentation has been reviewed and brought
 1017   up to date.
 1018 * Support for ultra-hires screen dumps suitable for large scale
 1019   printed output.
 1020 * Updated, more flexible binary scenery format.
 1021 * Support for using digital axes (i.e. a hat) as a pair of buttons
 1022   which can be mapped to any function a button could be mapped to.
 1023 * Added user documentation to the base package
 1024 * Added a c172 mini panel.
 1025 * Improved c172 panel graphics.
 1026 * Added units to configuration files
 1027 * Fixed X15 panel
 1028 * External view panning fix ups.
 1029 * Fixed the segfault on exit bug.
 1030 * Lots of property manager tweaks.  Appened units to property name to
 1031   make it explicit, adjusted read/write/archive bits and defaults
 1032 * MSVC fixups.
 1033 * gcc-3.0 fixups.
 1034 * Irix fixups.
 1035 * Fixed a potential segfault in radio station lookup/search code.
 1036 * Fixed a bug in the audio system intialization order that could cause
 1037   a segfault in some circumstances.
 1038 * Fixed a typo in the 2nd tank property name so it's value is now accessible
 1039   from the instrument panel. 
 1040 * Fixed a bug when loading the "old" binary scenery which prevented ground
 1041   lighting from being generated.
 1042 * Jettison old conditionally compiled plib-1.2.x code, we now require
 1043   plib-1.4.x or higher.
 1044 * Eliminated some convoluted that generated a harmless, but confusing
 1045   "*** NO TIMEZONE" error message,
 1046 * Fixed doubled bindings for joystick buttons.
 1047 * Threading fixups.
 1048 * Fixed a bug with the time warping/offset code.  You can again
 1049   startup with a proper time offset if you like.
 1050 * Fixed a couple memory problems ... attempting to access/use/write to
 1051   previously freed memory.
 1052 
 1053 New in 0.7.7
 1054 * June 20, 2001
 1055 
 1056 * Cleaned up various warning messages
 1057 * Various Cygwin fixes.
 1058 * Various MSVC fixes.
 1059 * Various Irix Mips fixes.
 1060 
 1061 * Check for null panel before passing mouse events to panel object.
 1062 * Fixed panel edge artifacts (due to unwanted texture wrapping.)
 1063 * Fixed a typo in the base/materials file.
 1064 * Various property manager fixes.
 1065 * Various property manager lookup optimizations.
 1066 * Fixed a bug in the autopilot altitude hold that crept in.
 1067 
 1068 * Converted from hardcoded to configurable keyboard bindings.
 1069 * Added an FGSubsystem base class so subsystems can be managed with a
 1070   common api.
 1071 * Keyboard commands are now completely remapable.  Removed BFI and
 1072   keyboard in place of remapable inputs.
 1073 * Started to impliment a command manager.  This along with the
 1074   property manager will go a long ways toward building infrastructure
 1075   for scripting.
 1076 * Started laying infrastructure for creating ultra-high-res tiled
 1077   screen shots suitable for printers.
 1078 * Synced with a recent version of JSBSim.
 1079 * GUI code split into smaller logical subcomponents.
 1080 * FGOptions converted to use property manager directly.
 1081 * "delta-t" and fdm interface timing fixes and tweaks.
 1082 * Added a sound effect manager class at the FlightGear level.
 1083 
 1084 * Support for setting a starting position as and offset distance (and /
 1085   or radial) from your specified starting postition.  This allows you to
 1086   initialize on final x miles out at y altitude.
 1087 * Many updates to make a much more realistic single engine and prop model
 1088   with atmospheric and velocity dependencies.  Fuel flow now modeled.
 1089 * Straightened out magnetic offset issues with VOR stations so we can
 1090   navigate properly from real avaition charts.
 1091 * Added a direct network interface support for the "Atlas" moving map
 1092   program.  (Output radio stack settings so current VOR and OBS can be
 1093   visualized.)
 1094 * Autopilot made to work more like a real world autopilot (rather than
 1095   based on perfect values.)  Autopilot wing leveler is slaved off the
 1096   turn coordinator.  Heading hold is slaved from the DG (which drifts).
 1097   Nav and ILS holds slave off the needle position.
 1098 * Backcorse ILS needle should move in correct direction now.
 1099 * Identing of NAV radios (and individual volume control) now work.
 1100 * Don't play DME ident if no colocated DME.
 1101 * VOR/ILS/ADF range pickup realistically modeled as per AIM.
 1102 * Added support for marker beacons.
 1103 * Support for loading and saving the current 'simulator state' using
 1104   an xml formated file.
 1105 * Added threaded tile paging for systems with pthread support.
 1106 * Added high level support for creating airport taxiway and runway signs.
 1107 * Many updates and fixes to the "installation and getting started" manual.
 1108 * Support for adding static objects to the scenery.
 1109 * Many updates and new features for the xml configurable panel engine.
 1110   Many corresponding improvements to the default instrument panel.
 1111 * Support added for incrementally numbering screen snapshots.
 1112 * Added support for a new, smaller, faster binary scenery format.
 1113 * Added an xml configurable HUD engine.
 1114 * Added interface glue to propogate wind values to LaRCsim.
 1115 
 1116 New in 0.7.6
 1117 * December 15, 2000
 1118 * Added night ground cover lights with user controllable densities on
 1119   a per texture basis.  Lights have a bit of a "fog punch through" effect.
 1120 * Support added for "shaped" instrument panels.
 1121 * Added support for virtual panels that are larger than the screen
 1122   space which can scroll.
 1123 * Added waypoint and route flying support to the autopilot and HUD.
 1124 * New highly detailed runway textures with accurate markings.
 1125 * Added a basic piston engine model, with support for rpm, egt, cht, mp,
 1126   and mixture.
 1127 * Many tweaks and improvements to the c172 instrument panel.
 1128 * Corrections and additions to the airport and navaid database.
 1129 * Added an external interface to the property manager so you can
 1130   "telnet" into a running copy of FlightGear, cd through the property
 1131   tree and examine and even change values, all from a remote computer.
 1132 * Improvements to flight model initialization.
 1133 * Fixes and improvements to the save/restore code.
 1134 * Added a load/save dialog box for saving/restoring your current flight.
 1135 * Program notes max texture size for your card/driver so it can load
 1136   higher resultion textures if they are available and if you can use
 1137   them.
 1138 * Added a visibility= command line option for setting intial visibility
 1139   distance.
 1140 * Range of tiles loaded and drawn are now directly calculated from the current
 1141   visibility distance so that the ground always blends smoothly into sky.
 1142 * Rewrote the tile caching scheme so it is now more flexible, more dynamic,
 1143   simpler, and more robust.
 1144 * Updates to the FDM bus.
 1145 * Many clean ups with the view code to prepare the way for a greater
 1146   variety of external views.
 1147 * MSVC project files now included in the source distribution.
 1148 * Fixed a view bug that could make the aircraft model appear rotated
 1149   incorrectly
 1150 * Fixed a bug with the autopilot rate of climb hold.
 1151 * Internal property manager tweaks.
 1152 * Additional materials can be aliased to an existing material to save
 1153   texture space (at the expense of less texture variety)
 1154 * MSVC tweaks.
 1155 * MacOS tweaks.
 1156 
 1157 New in 0.7.5
 1158 * September 18, 2000
 1159 * Aircraft now starts at end of runway closest to desired heading.
 1160 * Runways now have accurate markings.
 1161 * Addition of a completely reconfigurable instrument panel.
 1162 * Tons of panel tweaks and fixes.  Gyro now drifts, relocated whisky compass,
 1163   skid ball moves in the right direction, etc.
 1164 * Updates and tweaks to network multiplayer code.
 1165 * Tweaks to ground steering sensitivity.
 1166 * Updates to the UIUC flightmodel and icing research code.
 1167 * Fixed the sound problem in the previous version.
 1168 * Current scenery normal is now available for use.
 1169 * Current load queue size is now available for use.
 1170 * Added a configure time check for proper simgear version.
 1171 * Explicitely link in -lpthread if it exists.
 1172 * Fixed a couple namespace problems.
 1173 * MacOS and MSVC tweaks.
 1174 * Renamed JSBsim to JSBSim
 1175 * Added support in the material library for non-repeating textures.
 1176 
 1177 New in 0.7.4
 1178 * July 19, 2000
 1179 
 1180 * VOR reception now scales with altitude.
 1181 * Added differential braking support.
 1182 * Landing gear modeling code now works in JSBSim
 1183 * Overhauled cloud code substantially, new cloud textures.
 1184 * Added support for Ray Woodworth's 5 axis motion chair.
 1185 * Red light the panel at night and shade based on time of day.
 1186 
 1187 * Fixed autopilot altitude hold increment bug.
 1188 * Fixed screen snap shot function.
 1189 * Fixed mach number for LaRCsim.
 1190 * --start-date-gmt option fixed.
 1191 * Fixes to uiuc includes and initializations
 1192 * Fixes to periodic scheduler.
 1193 * Fixed a tile loading bug if the load queue wasn't empty before a reset or
 1194   teleport.
 1195 
 1196 * Some additional MSVC5 portability fixes.
 1197 * Tweaks to build with newest gcc under Irix contributed by Erik Hofman.
 1198 
 1199 * Clean out a pile of old junk in the material manager library from the
 1200   pre-ssg days, and majorly overhauled it.
 1201 * Complete reengineering of the panel code in preparation for moving the
 1202   configuration out into a data file.
 1203 * Lots of hashing around with Joystick support trying to achieve something
 1204   that is flexible enough to handle the zillions of possible configurations
 1205   out there.  Hopefully we are approaching a workable solution.
 1206 * Better windows support in our joystick module.
 1207 * View code simplifications and optimizations contributed by Norman Vine.
 1208 
 1209 * Added support for $FG_SCENERY and --fg-scenery=path so scenery can have a
 1210   different location from the base package.
 1211 * Moved drop in sky module, world time module, ephemeris module, and low
 1212   level communications modules over to simgear.
 1213 * Replaced gdbm with metakit
 1214 * Added David Megginson's property manager
 1215 
 1216 
 1217 New in 0.7.3
 1218 * May 18, 2000
 1219 * Added a radio stack 2 VOR/ILS and an ADF to the instrument panel.
 1220   You can change the frequencies by clicking on the knobs on the
 1221   instrument panels.  You can now navigate with VOR/ADF/DME and fly
 1222   ILS approaches.
 1223 * Added a chronometer to the instrument panel.
 1224 * Added a "wet" compass to the top of the instrument panel.
 1225 * Compass, vsi, and altitute instruments and vacuum system are more
 1226   accurately modeled.
 1227 * Added a magnetic variation model.
 1228 * Added navaid database management and query code.
 1229 * Added magvar offset to VOR radials.
 1230 * Heading bug now display magnetic heading rather than true heading.
 1231 * Autopilot now has modes to track a VOR and GS.
 1232 * Added custom joystick client support so sim can be flown from a
 1233   remote joystick connected to another machine.  This is in support of
 1234   some custom hardware located in the human factors research lab of the
 1235   university of minnesota.
 1236 * HUD controls are a bit different "h" toggles through day/night/off
 1237   modes and "H" cycles through brightness levels.
 1238 * Norman Vine contributed code to optionally do antialiased hud lines
 1239   on hardware that supports this.  Norman also contributed additional
 1240   hud cleanups and updates.
 1241 * Updates to JSBsim flight dynamics code that includes a generic
 1242   reconfigurable flight control system, a initial state trimming routine,
 1243   support for wind and weather, support for flaps, independent trim control,
 1244   config files changes
 1245 * Updates to LaRCsim flight dynamcis code contributed by UIUC that
 1246   allows loading aircraft specifications at runtime from config files.
 1247   UIUC is using flightgear as a platform to do icing research.  The UIUC
 1248   aircraft use the c172 gear model for now which causes some weirdness
 1249   on the ground for some of the larger aircraft.
 1250 * Flight model no longer has to be chosen at compile time.
 1251 * Separated ephemeris code from the actual sky rendering code and gave
 1252   this whole section a big overhaul.  The moon should now consistantly
 1253   have the correct phase.
 1254 * Rebuilt the sky dome using ssg.
 1255 * Removed dependencies on mat3.h and friends (old srgp support lib)
 1256 * Airport lookups now done through gdbm (a light weight embedded database.)
 1257 * Converted ssgVTable's to ssgVtxTables which do proper memory
 1258   management and should facilitate use of compiled vertex arrays once
 1259   ssg add support for these.
 1260 * Overhauled autopilot internals, separated out the gui controls from
 1261   the actual autopilot code.
 1262 * Cygwin32 build fixes
 1263 * MSVC++ build fixes
 1264 * Mac build fixes
 1265 
 1266 New in 0.7.2
 1267 * February 17, 2000
 1268 * Lots of code reorganizations
 1269 * Build requires plib-1.1.x
 1270 * Build requires SimGear-0.0.x
 1271 * LaRCsim/c172 is now the default aircraft model.
 1272 * Added flaps support to control model.
 1273 * Lots of updates and tweaks for the LaRCsim/c172 model.
 1274 * Use a more standard texture/blend mode combination for sun/moon halos to
 1275   avoid render path that's not supported by all cards/drivers.
 1276 * Change reported speed on hud from V_equiv_kts to V_calibrated_kts
 1277 * Instrument panel rewrite by David Megginson.  This isn't quite as flashy
 1278   as the first pass, but is much more functional, plays much better with 
 1279   opengl, and it should be relatively easy for someone with graphical skills
 1280   to make it look more spiffy.
 1281 * MacOS fixes contributed by Darrell Walisser.
 1282 * Many JSBsim updates.
 1283 * Added a screen snapshot facility (F3).
 1284 * Added a load/save state function contributed by David Megginson.
 1285 * Added support for various I/O protocols and channels so that flightgear
 1286   can communicate with itself and other programs through a variety of means.
 1287 * Bug fix:  The aircraft model used for external views was being included in 
 1288   the height above terrain check so when the view position and the aircraft
 1289   model collided the current altitude kept getting pushed up to compensate,
 1290   but of course the aircraft model would get pushed up as well because it
 1291   tracks the current aircraft position and orientation.  Thus you had a never
 1292   ending cycle ...
 1293 * Oliver's multiplayer network code now moved to his own subdirectory:
 1294   NetworkOLK
 1295 * Added simulated cloud puffs as we pass through the cloud layer.
 1296 * Cleaned up some memory leaks occuring between ssg and flightgear.
 1297 * Update to Christian's weather data base code.
 1298 
 1299 New in 0.7.1
 1300 * Durk Talsma added a nifty cloud layer.
 1301 * Default to Christian Mayer's new weather system.
 1302 * Added routines to do screen printing contributed by Mark Vallevand.
 1303 * Added routines to do screen shots to ppm graphics file (all platforms)
 1304   contributed Rich Kaszeta.
 1305 * Added a magic carpet (aka slew) mode.
 1306 * Added a hot air balloon simulator mode. (alpha)
 1307 * Added a simple (direct lincage) autocoordation feature.
 1308 * Added a mode to control view (side to side and up and down) with the mouse.
 1309 * Fixed a DEM decoding problem which caused most of the terrain to be 256
 1310   meter too high (and regenerated the world scenery with proper elevations.)
 1311 * Updates to JSBsim.
 1312 * Added support for a pilot view offset from the center of gravity.
 1313 * Various platform portability fixes.
 1314 * Updated time-offset/syncing command line options.
 1315 * Updated the FDM <==> Flight Gear interface to be more object oriented.
 1316   This should hopefully pave the way for being able to simulate several
 1317   concurrent entities.
 1318 * Removed unimplemented menu entries.
 1319 * Various scenery tools changes and enhancements in preparation for adding
 1320   runways (hopefully for the next release.)
 1321 
 1322 New in 0.7.0
 1323 * Autopilot can now fly great circle routes.
 1324 * Incorporated a first stab at some networking code contributed by Oliver
 1325   Delise.
 1326 * Added Christian Mayer's new weather subsystem.
 1327 * Started adding support for "external" views ... still needs some work.
 1328 * Added a flight model acceleration funtion.
 1329 * Added support for mouse yoke control contributed by David Megginson.
 1330 * FDM model hertz now definable from the command line.
 1331 * Added initial timezone support so the user can have better control and more 
 1332   options for setting the starting time of the sim.
 1333 * We now draw nonexistant tiles as ocean which means we only have to create
 1334   and distribute tiles that contain some sort of land mass.
 1335 
 1336 * Replaced basic render engine with plib's ssg (simple scene graph).
 1337 * Now expect plib to be installed in it's one true and official location.
 1338 * Added support for timegm() if it exists which explicitely expects GMT input.
 1339 * A bit of your basic code reorganization and shuffling.
 1340 
 1341 * Removed tools dependency on libgfc.  Functionality is now covered by 
 1342   shapelib which has been added into the Tools tree.
 1343 * Added support for the wonderful GSHHS global land mass data set.
 1344 * Removed dependecy on process-dem.pl script.
 1345 * Created a new distributed/parallel tile build system ... hmmm kind of super
 1346   computer or beowulf style stuff for getting large chunks of scenery built
 1347   as fast as possible.
 1348 * Only generate tiles that have land mass data since the sim can recreate pure
 1349   ocean tiles on the fly.
 1350 * First stab at a water flattening scheme to prevent oceans, lakes, and rivers
 1351   from running up and down the sides of hills.
 1352 * Changed the default "Work/" subdirectory layout.
 1353 * Updates to better handle segment boundaries in preparation for real airport
 1354   runway and lighting modeling.
 1355 * Updates and enhancements to my polygon management class.
 1356 
 1357 * Updates to JSBsim.
 1358 * Updates to Tony's c172 model.
 1359 * Updated getting started guide from Micheal Basler.
 1360 
 1361 * FreeBSD portability tweaks.
 1362 * MACos portability tweaks.
 1363 * Borland C++ tweaks.
 1364 * MSVC++ tweaks.
 1365 
 1366 New in 0.6.0
 1367 * Tons of improvements with scenery creation.  Inter-tile gaps have been
 1368   fixed, distorted textures have been fixed, real coastlines have been added,
 1369   and many other subtle improvements.
 1370 * Tools for parallelizing the scenery building tasks.  For instance by using
 1371   20 machines in parallel, scenery for the entire USA can be regenerated in
 1372   just over 4 hours vs. 70+ hours on a single machine.
 1373 * Texture scale can be specified (and changed)( in the materials file.  The
 1374   sim must be rerun for the change to take effect.
 1375 * Windows now uses plib joystick code so rudder pedals should now work.
 1376 * Now builds against Steve Baker's plib (portable game devel library) 
 1377   distributed separately (www.woodsoup.org/~sbaker/plib/)
 1378 * Many source code changes for the MacOS port contributed by Darrell
 1379   Walisser (the port isn't quite there yet ...)
 1380 * Source code changes for better compiling with the Borland compiler.
 1381 * Source code changes for better compiling with the native Irix compilers.
 1382 * Fixed a bug so you can now fly across the international date line (or
 1383   more precisely the division between longitude = +/-180.
 1384 * Tweaks to the Astro section contributed by Durk Talsma.
 1385 * Autopilot improvements contributed by Norman Vine.
 1386 * Fonts/characters now drawn with texture maps for increased speed.
 1387 * Instrument panel can be toggled on and off with "P".
 1388 * GUI interface for tweaking some autopilot parameters.
 1389 * HUD appearance and layout changes contributed by Norman Vine, includes
 1390   faster font drawing for much better performance.
 1391 * Reset function added to reset you to your starting conditions.
 1392 * GUI function to enter a new airport id (and be transported there)
 1393 * Added serial output support for an "in-development" full motion cockpit.
 1394 * "Just in time" texture loading to reduce initial sim loading time.
 1395 
 1396 
 1397 New in 0.59 (This is an intermediate/stepping stone release.  Skip this 
 1398              release if you are interested in stability.)
 1399 * IRIX portability changes and support for native SGI compilers.
 1400 * Solaris portability tweaks
 1401 * Incorporated some MacOS portability changes (although the port is not
 1402   yet complete.)
 1403 * Changes to allow adjustment of the autopilot settings while it is
 1404   activated.
 1405 * Began complete overhaul of scenery generation tools.
 1406 * Fixed a view frustum culling bug.
 1407 * separated lib GPC (generic polygon clipper.)  GPC is not "freeware" and
 1408   the author has explicitely refused our request to distribute source code
 1409   for this library with Flight Gear.
 1410 * updated installation and getting started guide
 1411 * switched to a simpler, lighter weight frame rate calculation method.
 1412 * new tile division scheme.
 1413 * GPS serial *output* fixes.
 1414 * Added a nifty halo to both the sun and moon.  Preparation for allowing
 1415   subtle moon lighting effects at night.
 1416 * Incorporated Jon Berndt's new C++ flight model rewrite.
 1417 * Autopilot settings can be adjusted while active.
 1418 * Updates to the instrument panel.
 1419 * Fixed AOA reading on the HUD.
 1420 * Added random splash screens.
 1421 * Modified scenery loader to accept tri-fans.
 1422 * Other non-backwards compatible changes to scenery file format and tile
 1423   layout.
 1424 
 1425 
 1426 New in 0.58
 1427 * Added JSBsim alpha code ... this is Jon S. Berndts alpha FDM rewrite.
 1428   Still lots to do, but you can watch a balistic flight for a short time.
 1429 * Renamed Simulator/Flight to Simulator/FDM
 1430 * Tweaks to assist building FGFS on solaris platforms.
 1431 * Moved Lib/DEM to Tools/DEM
 1432 * Started preparations for scenery generation tools overhaul.
 1433 * More MSVC++ support.
 1434 * Removed code that made the sun bigger at the horizon since this is just
 1435   an optical illusion in real life.
 1436 * Bug fixed so that the sim can start out at an airport below sea level.
 1437 
 1438 New in 0.57
 1439 * Converted to a simpler frame rate counting method.
 1440 * Fixed the AOA reading on the HUD.
 1441 * Removed gpc from the Lib section of distribution by request of the
 1442   gpc Author.  The gpc license is unfortunately not compatible with
 1443   the GPL.  I may look for an alternative library, or just require
 1444   that developers download this library separately.
 1445 * First slew of changes from the MacOS porting effort contributed by
 1446  "Robert Puyol" <puyol@abvent.fr>.
 1447 * Support for an arbitrary number of serial ports + additional serial port 
 1448   output tweaks.
 1449 * Serial output tweaks to make things more robust and act more like a GPS.
 1450 * Portability enhancements for Borland, Solaris, and SGI.
 1451 * Some internal class renaming and reorganizations.  fgFLIGHT becomes FGState.
 1452   fgCONTROLS becomes FGControls.
 1453 * Started work on an "external" flight model so the sim can be driven from
 1454   external input (serial port, network, file, etc.)
 1455 * Fixed a problem that creeped in with setting the initial startup altitude.
 1456   This could cause an unrecoverable bounce and you'd end up flipped on your
 1457   back.  Should be fixed now.
 1458 * Sun now appears to grow in size as it gets very low in the horizon.
 1459 * Fixed a view frustum culling bug where the scene was not accurately culled
 1460   when your view was anything other than straight forward.
 1461 
 1462 New in 0.56
 1463 * Changed default HUD units to the more standard feet units.  You can still
 1464   use meters by specifying the command line option "--units-meters".
 1465 * Added some initial joystick support using Steve's joystick interface class.
 1466   This works great under Linux, but Steve's class now needs to be ported to
 1467   Windoze and other platforms.
 1468 * Also added a fall back to the GLUT joystick routines for windows (until
 1469   we can find better joystick support.)
 1470 * Added some initial serial port support for acting like gps and outputing 
 1471   nmea data such that could be fed into a flight map software package.
 1472 * Miscellaneous code clean ups, portability improvements, and optimizations.
 1473 * Switched to a streams based error/debug logging system that can be
 1474   completely stripped out for a release build (./configure --without-logging)
 1475 * Support for cygwin32 b20 compiler (latest release)
 1476 * Continued progress on instrument panel
 1477 * Support for starting fgfs at higher resolutions.
 1478 
 1479 New in 0.55
 1480 * New version of gpc (generic polygon clipping library) from 
 1481   http://www.cs.man.ac.uk/aig/staff/alan/software/
 1482 * Brakes (use "b" to toggle)
 1483 * Added an altitude hold module to the autopilot.  Lock your current altitude
 1484   with "ctrl-a", "cntr-a" again will deactivate.  (Also lock your current 
 1485   heading with "ctrl-h", and again to deactivate.)
 1486 * Added a terrain following module ... "ctrl-t" to activate.
 1487 * Added an autothrottle ... "ctrl-s" to activate.
 1488 * Fixes so that terrain tools will work in windoze.
 1489 * More STL & Compiler compatibility fixes.
 1490 * Changes to use a Point3 class.
 1491 * Fixed win95/98 time problem that limited fps to about 18.3
 1492 
 1493 New in 0.54
 1494 * Implimented audio envelopes so that pitch of engine changes with throttle
 1495 * Textured moon, and rewritten/restructured Astro code.
 1496 * More optimizations and code cleanups.  (Norman Vine, Bernie Bright, Charlie
 1497   Hotchkiss.)
 1498 * Bug fixed that was causing odd display artifacts due to a degenerate
 1499   fragment being created for every tile.
 1500 * Bug fixed that caused scenery generation to go bad (misplaced fclose on an
 1501   invalid file descriptor.)
 1502 * Code changes to support g++ 2.7 STL (from Bernie Bright)
 1503 
 1504 New in 0.53
 1505 * Some initial "GameGLUT" support contributed by Gary R. Van Sickle
 1506   (tiberius@braemarinc.com)
 1507 * Tracked down and eliminated some memory access type bugs that were
 1508   causing segfaults on some platforms, with some compilers using various
 1509   optimization flags.
 1510 * Assorted code optimizations submitted by Norman Vine.
 1511 * Renamed fg -> fgfs
 1512 * Shuffled files.  
 1513   - Created a new directory Simulator/Airports/ to handle airport data 
 1514     specific tasks 
 1515   - Created Simulator/Object/ to handle basic rendering objects
 1516 * Panel code update from Friedemann Reinhard (use --enable-panel to activate)
 1517 * Contributions from Bernie Bright
 1518   - Created some new classes to enable pointers-to-functions and
 1519     pointers-to-class-methods to be treated like objects.  These objects
 1520     can be registered with fgEVENT_MGR.
 1521   - File "Include/fg_callback.hxx" contains the callback class defns.
 1522   - Modified fgEVENT and fgEVENT_MGR to use the callback classes.  Also
 1523     some minor tweaks to STL usage.
 1524   - Added file "Include/fg_stl_config.h" to deal with STL portability
 1525     issues.  Added an initial config for egcs (and probably gcc-2.8.x).
 1526     Don't have access to Visual C++ so I've left that for someone else.
 1527   - This file is influenced by the stl_config.h file delivered with egcs.
 1528   - Added "Include/auto_ptr.hxx" which contains an implementation of the
 1529     STL auto_ptr class which is not provided in all STL implementations
 1530     and is needed to use the callback classes.
 1531   - Deleted fgLightUpdate() which was just a wrapper to call
 1532     fgLIGHT::Update().
 1533   - Modified fg_init.cxx to register two method callbacks in place of the
 1534     old wrapper functions.
 1535   - The new classes in libmisc.tgz define a stream interface into zlib.       
 1536     I've put these in a new directory, Lib/Misc.  Feel free to rename it      
 1537     to something more appropriate.  However you'll have to change the         
 1538     include directives in all the other files.  Additionally you'll have      
 1539     add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.        
 1540                                                                               
 1541     The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf        
 1542     test so I've included the required changes in config.tgz.                 
 1543                                                                               
 1544     There are a fair few changes to Simulator/Objects as I've moved           
 1545     things around.  Loading tiles is quicker but thats not where the delay    
 1546     is.  Tile loading takes a few tenths of a second per file on a P200       
 1547     but it seems to be the post-processing that leads to a noticeable         
 1548     blip in framerate.  I suppose its time to start profiling to see where    
 1549     the delays are.                                                           
 1550                                                                               
 1551     I've included a brief description of each archives contents.              
 1552                                                                               
 1553     Lib/Misc/
 1554       zfstream.cxx
 1555       zfstream.hxx
 1556         C++ stream interface into zlib.
 1557         Taken from zlib-1.1.3/contrib/iostream/.
 1558         Minor mods for STL compatibility.
 1559         There's no copyright associated with these so I assume they're
 1560         covered by zlib's.
 1561 
 1562       fgstream.cxx
 1563       fgstream.hxx
 1564         FlightGear input stream using gz_ifstream.  Tries to open the
 1565         given filename.  If that fails then filename is examined and a
 1566         ".gz" suffix is removed or appended and that file is opened.
 1567 
 1568       stopwatch.hxx
 1569         A simple timer for benchmarking.  Not used in production code.
 1570         Taken from the Blitz++ project.  Covered by GPL.
 1571 
 1572       strutils.cxx
 1573       strutils.hxx
 1574         Some simple string manipulation routines.
 1575 
 1576     Simulator/Airports/
 1577       Load airports database using fgstream.
 1578       Changed fgAIRPORTS to use set<> instead of map<>.
 1579       Added bool fgAIRPORTS::search() as a neater way doing the lookup.
 1580       Returns true if found.
 1581 
 1582     Simulator/Astro/
 1583       Modified fgStarsInit() to load stars database using fgstream.
 1584 
 1585     Simulator/Objects/
 1586       Modified fgObjLoad() to use fgstream.
 1587       Modified fgMATERIAL_MGR::load_lib() to use fgstream.
 1588       Many changes to fgMATERIAL.
 1589       Some changes to fgFRAGMENT but I forget what!
 1590 
 1591 New in 0.52
 1592 * Stars added in 8 stages as sky gets darker for a smoother more realistic
 1593   transition.
 1594 * rewrote star loader to significantly improve load times.
 1595 * Tweaked sky brightness and dawn/dusk colors.
 1596 * Fixed a small problem with moon rendering.
 1597 * Fog color tries to track the sky color at the center of view in sunrise
 1598   and sunset situations.
 1599 * Optimizations from Norman Vine
 1600 * Code fixes and tweaks from Charlie Hotchkiss.
 1601 * Added an --enable/disable-sound option.
 1602 * Added a pause key "p"
 1603 * Added command line options to specify initial position and orientation.
 1604 * Added command line option to start in paused or unpaused state.
 1605 
 1606 New in 0.51
 1607 * Translucent menus
 1608 * Various HUD intensities so you can find something that is readable for the
 1609   current conditions and lighting.
 1610 * Tie visibility to far clip plane & view frustum culling so reducting
 1611   visibility can increase frame rates by increasing what is culled.
 1612 * Fixed stupid bug with misplaced initial position.
 1613 * Hopefully fixed a bug when parsing system.fgfsrc on windoze.
 1614 
 1615 New in 0.50
 1616 * HUD updates from Charlie Hotchkiss (ladder number rotate w/ ladder, control
 1617   position indicators are back)
 1618 * Only draw the PUI cursor if Mesa/Glide/Fullscreen.
 1619 * Added mipmapping.
 1620 * Calculate the model view transformation matrix once per tile per iteration.
 1621   Then glLoadMatrixd() it for each fragment rather than calling push(), 
 1622   translate(), pop().
 1623 * Added a basic splash screen.
 1624 * Added support for switching between fullscreen and window mode for 
 1625   Mesa/3dfx/glide.
 1626 * added an enable/disable splash screen option
 1627 * added an enable/disable intro music option
 1628 * added an enable/disable instrument panel option
 1629 * added an enable/disable mouse pointer option
 1630 * Ground collision detection.  You can now land or test for collision with
 1631   any scenery surface.
 1632 * Converted angle of attack scale into a radio altimeter.
 1633 
 1634 New in 0.49
 1635 * Managment of multiple textures
 1636 * Incorporated Friedemann Reinhard's initial panel code.
 1637 * Fog mode is now GL_FOG_EXP2 instead of GL_FOG_LINEAR
 1638 * Build the non-shared pieces of the FG sim as static libs.
 1639 
 1640 New in 0.48
 1641 * Incorporated Steve Baker's PUI user interface library written
 1642   entirely on top of OpenGL
 1643 * Incorporated Steve Baker's Audio library which currently only
 1644   supports Linux, but a win32 port is very close to being done.
 1645 * Sort object fragments by material property before rendering.  This
 1646   will be a big help to performance when we start including objects
 1647   with a wide variety of material properties and textures.
 1648 * Overlapped scenery tiles to reduce the chance of an occasional
 1649   floating point precission induced gaps.
 1650 * Fixed a bug in zlib exposed by Borland Win32 compiler.
 1651 * Impose a maximum triangle area during scenery generation so even
 1652   very flat areas will get split into a few smaller sub triangles.
 1653 * Fine grained (fragment level) view frustum culling.
 1654 * view transformation optimizations -- Norman Vine.
 1655 * Fixed polygon winding problem in scenery generation, so all
 1656   tri-strips are wound counter clockwise (opengl default).
 1657 
 1658 New in 0.47
 1659 * Course (per tile) view frustum culling.
 1660 * Added a command line option to specify --fg-root which will override
 1661   $FG_ROOT
 1662 * Hard coded default locations for FG_ROOT for situations when nothing
 1663   is specified.  Unix = /usr/local/lib/FlightGear  Win32 = \FlightGear
 1664 * Restructured the command line processing code so that it can process
 1665   these sames comands (one per line) out of a config file.
 1666 * Added a command line option to specify field of view.  This is
 1667   adjustable at run time using "X / x".  Supporting code contributed
 1668   by Norman Vine.
 1669 
 1670 New in 0.46:
 1671 * Complete C++ re-write of the HUD section.
 1672 * Miscellaneous bug fixes and tweaks.
 1673 
 1674 New in 0.45:
 1675 * Added an option to enable/disable wireframe rendering.
 1676 * Added an option to enable/disable fog/haze.
 1677 * Added an option to enable/disable sky blending.
 1678 * Added an option to select smooth/flat polygon shading.
 1679 * Added an option to enable full-screen mode.
 1680 * Added a visual frame rate counter on the HUD.  (Contributed by Durk Talsma)
 1681 * Autopilot updates (Jeff Goeke-Smith)
 1682 * Added an option to control the number of neighboring tiles that are drawn
 1683 
 1684 New in 0.44: 
 1685 * Fixed a horible bug that cause the time to be *WAY* off when
 1686   compiling with the CygWin32 compiler.
 1687 * Wrap up zlib so we can conditionally compile back in normal behavior
 1688   on systems that have trouble building zlib.
 1689 * Minor adjustment to texture coordinate generation to reduce texture
 1690   swimming.
 1691 * Added a command line option to enable/disable texture maps
 1692 * Minor transformation adjustments to try to keep scenery tiles closer
 1693   to (0, 0, 0) GLfloats run out of precision at the distances we need
 1694   to model the earth, but we can do a bunch of pre-transformations
 1695   using double floats and then cast to GLfloat once everything is
 1696   close in where we have less precision problems.
 1697 * command line option to set starting position by airport ID
 1698 * Cleaned up initialization sequence to eliminate interdependencies
 1699   between sun position, lighting, and view position.  This creates a
 1700   valid single pass initialization path.
 1701 * use already calculated LaRCsim values to create the roll/pitch/yaw
 1702   transformation matrix
 1703 
 1704 New in 0.43:
 1705 * material properties bug fixed when rendering terrain.
 1706 * bug in sky color generation fixed.
 1707 * bug in fog color generation fixed.
 1708 * zlib on the fly decompression/compression support.
 1709 * more code reorganization and clean ups.
 1710 * a fixed up 30 arcsec DEM file preprocessor.  World wide DEM's are 
 1711   available in this format.
 1712 
 1713 New in 0.42:
 1714 * Simple autopilot heading hold contributed by 
 1715   Jeff Goeke-Smith <jgoeke@voyager.net>
 1716 * More code reorganization and clean ups.
 1717 
 1718 New in 0.41:
 1719 * Many autoconf cleanups and tweaks
 1720 * make and make install work in unix
 1721 * make works for cygnus win32 (but not install yet)
 1722 * make dist now works
 1723 * added the Tools directory into the main source tree
 1724 
 1725 New in 0.40:
 1726 * Gnu automake/autoconf/libtool make system
 1727 * Initial texture support
 1728 * Bug fixes